Automatic control device



Oct. 25, 1932.

'K. SCHWEIZER AUTOMATIC CONTROL DEVICE Filed March 21. 1950 Patented on. 25, 1932 I UNITED ST TE PATENT- OFFICE KARL SCHWEIZER, OI STUT'I'GART, GERMANY, ASSIGNOB AKTIENGESHLSCHAFT, OI STUTTGART, G

BOSCH avzrom'nc common mwxcn Application filed ltarchfil, 1980, Serial Io. 487,788, and in Germany June 89, 1989.

This invention relatesfto improvements in 4 and 5, between which rangements of internal combustion engines in which the time of ignition is varied according 'to the velocity of centrifugal governor weights. I

In such apparatus the centrifugal governor weights in addition to the loading due to the moment of rotation of the governor must also constantly overcome a centripetal spring force which tends to return them into their position of rest. The return action of this spring operates over a very wide range as the control range of regulators of this type is very considerable.

This is attained according to this invention by using helical springs as which are deflected by the weights substantially transversely to their longitudinal axis. In this method of tensioning, the springs themselves at first offer only a small resistance in spite of considerable tension; this resistance, however, increases with the increasing deflection of the spring. The regulation curve of a regulator with springs tensioned in this manner is particularly good if irrespectiveof t e lever arms, the return force of the centrifugal weights is increased with increased throw of the weights.

One form of construction of the invention is illustrated by way of example, inthe drawing in which Figure 1 is a drumgoveriy'or bowl in longitudinalsection.

Figure 2 is a plan view of the governor in the position 'of rest.

Figure 3 is plan view of a governor in working position of theparts. I

Secured to the driving-shaft 1, is a flange 2, on which rests the base plate 3 of the governor. Mounted on the base plate are four pins two helical springs 6, are tensioned. The pins4 act as bearings for two centrifugal weights 7 Mounted on the centrifugal weights by two screws 8, are culgyed elements 9, which operate the variation of the ignition tuningby their inertia and the shape of their curved'sides 11). As clearly shown in Figure 1, cam elements 9 are se-' cured to the top faces of weights 7 by two clearly shown in return springs parts, cam surfaces spaced screws 8. On the weights 7, are slots 11 in which slide adjusting pins 12. The displaceable sleeve 14 is mounted on the reduced end 13, of the shaft 1, which sleeve is integral with the cam 15, for the make and break and with the guide 16 for the rotating distributor. The lower part of this sleeve is extended to form the pins 12.

The mode of o eration of the regulator is Figures 2 and 3.

I declare that what I claim is:

1.- A centrifu l governor comprising in combination a iving part, a drlven part centrifugally movable weights on one of sai' parts, a connection between said wei hts and u parts, cam surfaces on said weights, a con- 75 nection between said weights and the other part, tension coil springs niounted on the part on which said weights are mounted and arranged to be .deflectedby said cam surfaces transverely to their longitudinal axes upon displacement of said parts. 3. A centrifugal governor comprising in combination a driving part, a 'drivenpart,

centrifugally movable wei hts on one of said on said weights, .a con- 80 nection between said weights and ,the other part, tension coil springs mounted between the pivot journals of said weights and the part on which'they are mounted and arranged to be deflected transversely of their 00 longitudinal axis by said cam surfaces with increasing leverage according to increase of movement of said weights due to centrifugal: force.

4. A centrifugal combination a driving part, a driven part, centrifugally movable weights on one ofsaid parts, a connection between said weights and the'other part, springs between twopins on the driving 'part, and means to deflect said 10 governor comprising in 96 2 assign-i springs substantially transversely to their longitudinal axes on the displacement of the weights.

5. As an article of manufacture a centrifu gal governor for variation of timing of internal combustion engines comprising in combination a driving shaft, a plate on said shaft, pivot pins on said plate, centrifugally movable weights pivoted on said pins, U cam surfaces on said wei hts, coil tension springs between the pivot ournals of said i and said plate, adapted to be deflected substantially transversely of their longitudinal.

axis by said cam surfaces, a driven part, pins on said driven part engaging injslots formed in said weights, a cam on said-driven part for controlling an electrical make-andreak, and a connection on said driven part to an electrical distributor.

y 6. A centrifugal governor comprisin a drivin member, a driven member, centrl gal weights pivotally mounted on said drivmg member, resilient meansopposed to the action of said centrifugal weights, and cam -means for displacing said resilient means,

said cam means being so shaped as to increase the force exerted by the resilient means more rapidly than the increase of the force due to centrifugal wei hts with the iiicrease 30 of rotational speeds 0% the driving member.

In testimony whereof I have hereunto alf-' fixed my signature. KARL. SCHWEIZER. 

